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perl/locale.c
Karl Williamson a9ad02a848 locale.c: Add comment
2016-03-17 16:13:49 -06:00

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/* locale.c
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
* 2002, 2003, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* A Elbereth Gilthoniel,
* silivren penna míriel
* o menel aglar elenath!
* Na-chaered palan-díriel
* o galadhremmin ennorath,
* Fanuilos, le linnathon
* nef aear, si nef aearon!
*
* [p.238 of _The Lord of the Rings_, II/i: "Many Meetings"]
*/
/* utility functions for handling locale-specific stuff like what
* character represents the decimal point.
*
* All C programs have an underlying locale. Perl generally doesn't pay any
* attention to it except within the scope of a 'use locale'. For most
* categories, it accomplishes this by just using different operations if it is
* in such scope than if not. However, various libc functions called by Perl
* are affected by the LC_NUMERIC category, so there are macros in perl.h that
* are used to toggle between the current locale and the C locale depending on
* the desired behavior of those functions at the moment. And, LC_MESSAGES is
* switched to the C locale for outputting the message unless within the scope
* of 'use locale'.
*/
#include "EXTERN.h"
#define PERL_IN_LOCALE_C
#include "perl.h"
#ifdef I_LANGINFO
# include <langinfo.h>
#endif
#include "reentr.h"
#ifdef USE_LOCALE
/*
* Standardize the locale name from a string returned by 'setlocale', possibly
* modifying that string.
*
* The typical return value of setlocale() is either
* (1) "xx_YY" if the first argument of setlocale() is not LC_ALL
* (2) "xa_YY xb_YY ..." if the first argument of setlocale() is LC_ALL
* (the space-separated values represent the various sublocales,
* in some unspecified order). This is not handled by this function.
*
* In some platforms it has a form like "LC_SOMETHING=Lang_Country.866\n",
* which is harmful for further use of the string in setlocale(). This
* function removes the trailing new line and everything up through the '='
*
*/
STATIC char *
S_stdize_locale(pTHX_ char *locs)
{
const char * const s = strchr(locs, '=');
bool okay = TRUE;
PERL_ARGS_ASSERT_STDIZE_LOCALE;
if (s) {
const char * const t = strchr(s, '.');
okay = FALSE;
if (t) {
const char * const u = strchr(t, '\n');
if (u && (u[1] == 0)) {
const STRLEN len = u - s;
Move(s + 1, locs, len, char);
locs[len] = 0;
okay = TRUE;
}
}
}
if (!okay)
Perl_croak(aTHX_ "Can't fix broken locale name \"%s\"", locs);
return locs;
}
#endif
void
Perl_set_numeric_radix(pTHX)
{
#ifdef USE_LOCALE_NUMERIC
# ifdef HAS_LOCALECONV
const struct lconv* const lc = localeconv();
if (lc && lc->decimal_point) {
if (lc->decimal_point[0] == '.' && lc->decimal_point[1] == 0) {
SvREFCNT_dec(PL_numeric_radix_sv);
PL_numeric_radix_sv = NULL;
}
else {
if (PL_numeric_radix_sv)
sv_setpv(PL_numeric_radix_sv, lc->decimal_point);
else
PL_numeric_radix_sv = newSVpv(lc->decimal_point, 0);
if (! is_invariant_string((U8 *) lc->decimal_point, 0)
&& is_utf8_string((U8 *) lc->decimal_point, 0)
&& _is_cur_LC_category_utf8(LC_NUMERIC))
{
SvUTF8_on(PL_numeric_radix_sv);
}
}
}
else
PL_numeric_radix_sv = NULL;
DEBUG_L(PerlIO_printf(Perl_debug_log, "Locale radix is %s, ?UTF-8=%d\n",
(PL_numeric_radix_sv)
? SvPVX(PL_numeric_radix_sv)
: "NULL",
(PL_numeric_radix_sv)
? cBOOL(SvUTF8(PL_numeric_radix_sv))
: 0));
# endif /* HAS_LOCALECONV */
#endif /* USE_LOCALE_NUMERIC */
}
/* Is the C string input 'name' "C" or "POSIX"? If so, and 'name' is the
* return of setlocale(), then this is extremely likely to be the C or POSIX
* locale. However, the output of setlocale() is documented to be opaque, but
* the odds are extremely small that it would return these two strings for some
* other locale. Note that VMS in these two locales includes many non-ASCII
* characters as controls and punctuation (below are hex bytes):
* cntrl: 00-1F 7F 84-97 9B-9F
* punct: 21-2F 3A-40 5B-60 7B-7E A1-A3 A5 A7-AB B0-B3 B5-B7 B9-BD BF-CF D1-DD DF-EF F1-FD
* Oddly, none there are listed as alphas, though some represent alphabetics
* http://www.nntp.perl.org/group/perl.perl5.porters/2013/02/msg198753.html */
#define isNAME_C_OR_POSIX(name) ((name) != NULL \
&& ((*(name) == 'C' && (*(name + 1)) == '\0') \
|| strEQ((name), "POSIX")))
void
Perl_new_numeric(pTHX_ const char *newnum)
{
#ifdef USE_LOCALE_NUMERIC
/* Called after all libc setlocale() calls affecting LC_NUMERIC, to tell
* core Perl this and that 'newnum' is the name of the new locale.
* It installs this locale as the current underlying default.
*
* The default locale and the C locale can be toggled between by use of the
* set_numeric_local() and set_numeric_standard() functions, which should
* probably not be called directly, but only via macros like
* SET_NUMERIC_STANDARD() in perl.h.
*
* The toggling is necessary mainly so that a non-dot radix decimal point
* character can be output, while allowing internal calculations to use a
* dot.
*
* This sets several interpreter-level variables:
* PL_numeric_name The underlying locale's name: a copy of 'newnum'
* PL_numeric_local A boolean indicating if the toggled state is such
* that the current locale is the program's underlying
* locale
* PL_numeric_standard An int indicating if the toggled state is such
* that the current locale is the C locale. If non-zero,
* it is in C; if > 1, it means it may not be toggled away
* from C.
* Note that both of the last two variables can be true at the same time,
* if the underlying locale is C. (Toggling is a no-op under these
* circumstances.)
*
* Any code changing the locale (outside this file) should use
* POSIX::setlocale, which calls this function. Therefore this function
* should be called directly only from this file and from
* POSIX::setlocale() */
char *save_newnum;
if (! newnum) {
Safefree(PL_numeric_name);
PL_numeric_name = NULL;
PL_numeric_standard = TRUE;
PL_numeric_local = TRUE;
return;
}
save_newnum = stdize_locale(savepv(newnum));
PL_numeric_standard = isNAME_C_OR_POSIX(save_newnum);
PL_numeric_local = TRUE;
if (! PL_numeric_name || strNE(PL_numeric_name, save_newnum)) {
Safefree(PL_numeric_name);
PL_numeric_name = save_newnum;
}
else {
Safefree(save_newnum);
}
/* Keep LC_NUMERIC in the C locale. This is for XS modules, so they don't
* have to worry about the radix being a non-dot. (Core operations that
* need the underlying locale change to it temporarily). */
set_numeric_standard();
set_numeric_radix();
#else
PERL_UNUSED_ARG(newnum);
#endif /* USE_LOCALE_NUMERIC */
}
void
Perl_set_numeric_standard(pTHX)
{
#ifdef USE_LOCALE_NUMERIC
/* Toggle the LC_NUMERIC locale to C. Most code should use the macros like
* SET_NUMERIC_STANDARD() in perl.h instead of calling this directly. The
* macro avoids calling this routine if toggling isn't necessary according
* to our records (which could be wrong if some XS code has changed the
* locale behind our back) */
setlocale(LC_NUMERIC, "C");
PL_numeric_standard = TRUE;
PL_numeric_local = isNAME_C_OR_POSIX(PL_numeric_name);
set_numeric_radix();
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Underlying LC_NUMERIC locale now is C\n"));
#endif /* USE_LOCALE_NUMERIC */
}
void
Perl_set_numeric_local(pTHX)
{
#ifdef USE_LOCALE_NUMERIC
/* Toggle the LC_NUMERIC locale to the current underlying default. Most
* code should use the macros like SET_NUMERIC_LOCAL() in perl.h instead of
* calling this directly. The macro avoids calling this routine if
* toggling isn't necessary according to our records (which could be wrong
* if some XS code has changed the locale behind our back) */
setlocale(LC_NUMERIC, PL_numeric_name);
PL_numeric_standard = isNAME_C_OR_POSIX(PL_numeric_name);
PL_numeric_local = TRUE;
set_numeric_radix();
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Underlying LC_NUMERIC locale now is %s\n",
PL_numeric_name));
#endif /* USE_LOCALE_NUMERIC */
}
/*
* Set up for a new ctype locale.
*/
void
Perl_new_ctype(pTHX_ const char *newctype)
{
#ifdef USE_LOCALE_CTYPE
/* Called after all libc setlocale() calls affecting LC_CTYPE, to tell
* core Perl this and that 'newctype' is the name of the new locale.
*
* This function sets up the folding arrays for all 256 bytes, assuming
* that tofold() is tolc() since fold case is not a concept in POSIX,
*
* Any code changing the locale (outside this file) should use
* POSIX::setlocale, which calls this function. Therefore this function
* should be called directly only from this file and from
* POSIX::setlocale() */
dVAR;
UV i;
PERL_ARGS_ASSERT_NEW_CTYPE;
/* We will replace any bad locale warning with 1) nothing if the new one is
* ok; or 2) a new warning for the bad new locale */
if (PL_warn_locale) {
SvREFCNT_dec_NN(PL_warn_locale);
PL_warn_locale = NULL;
}
PL_in_utf8_CTYPE_locale = _is_cur_LC_category_utf8(LC_CTYPE);
/* A UTF-8 locale gets standard rules. But note that code still has to
* handle this specially because of the three problematic code points */
if (PL_in_utf8_CTYPE_locale) {
Copy(PL_fold_latin1, PL_fold_locale, 256, U8);
}
else {
/* Assume enough space for every character being bad. 4 spaces each
* for the 94 printable characters that are output like "'x' "; and 5
* spaces each for "'\\' ", "'\t' ", and "'\n' "; plus a terminating
* NUL */
char bad_chars_list[ (94 * 4) + (3 * 5) + 1 ];
bool check_for_problems = ckWARN_d(WARN_LOCALE); /* No warnings means
no check */
bool multi_byte_locale = FALSE; /* Assume is a single-byte locale
to start */
unsigned int bad_count = 0; /* Count of bad characters */
for (i = 0; i < 256; i++) {
if (isUPPER_LC((U8) i))
PL_fold_locale[i] = (U8) toLOWER_LC((U8) i);
else if (isLOWER_LC((U8) i))
PL_fold_locale[i] = (U8) toUPPER_LC((U8) i);
else
PL_fold_locale[i] = (U8) i;
/* If checking for locale problems, see if the native ASCII-range
* printables plus \n and \t are in their expected categories in
* the new locale. If not, this could mean big trouble, upending
* Perl's and most programs' assumptions, like having a
* metacharacter with special meaning become a \w. Fortunately,
* it's very rare to find locales that aren't supersets of ASCII
* nowadays. It isn't a problem for most controls to be changed
* into something else; we check only \n and \t, though perhaps \r
* could be an issue as well. */
if (check_for_problems
&& (isGRAPH_A(i) || isBLANK_A(i) || i == '\n'))
{
if ((isALPHANUMERIC_A(i) && ! isALPHANUMERIC_LC(i))
|| (isPUNCT_A(i) && ! isPUNCT_LC(i))
|| (isBLANK_A(i) && ! isBLANK_LC(i))
|| (i == '\n' && ! isCNTRL_LC(i)))
{
if (bad_count) { /* Separate multiple entries with a
blank */
bad_chars_list[bad_count++] = ' ';
}
bad_chars_list[bad_count++] = '\'';
if (isPRINT_A(i)) {
bad_chars_list[bad_count++] = (char) i;
}
else {
bad_chars_list[bad_count++] = '\\';
if (i == '\n') {
bad_chars_list[bad_count++] = 'n';
}
else {
assert(i == '\t');
bad_chars_list[bad_count++] = 't';
}
}
bad_chars_list[bad_count++] = '\'';
bad_chars_list[bad_count] = '\0';
}
}
}
#ifdef MB_CUR_MAX
/* We only handle single-byte locales (outside of UTF-8 ones; so if
* this locale requires than one byte, there are going to be
* problems. */
if (check_for_problems && MB_CUR_MAX > 1
/* Some platforms return MB_CUR_MAX > 1 for even the "C"
* locale. Just assume that the implementation for them (plus
* for POSIX) is correct and the > 1 value is spurious. (Since
* these are specially handled to never be considered UTF-8
* locales, as long as this is the only problem, everything
* should work fine */
&& strNE(newctype, "C") && strNE(newctype, "POSIX"))
{
multi_byte_locale = TRUE;
}
#endif
if (bad_count || multi_byte_locale) {
PL_warn_locale = Perl_newSVpvf(aTHX_
"Locale '%s' may not work well.%s%s%s\n",
newctype,
(multi_byte_locale)
? " Some characters in it are not recognized by"
" Perl."
: "",
(bad_count)
? "\nThe following characters (and maybe others)"
" may not have the same meaning as the Perl"
" program expects:\n"
: "",
(bad_count)
? bad_chars_list
: ""
);
/* If we are actually in the scope of the locale, output the
* message now. Otherwise we save it to be output at the first
* operation using this locale, if that actually happens. Most
* programs don't use locales, so they are immune to bad ones */
if (IN_LC(LC_CTYPE)) {
/* We have to save 'newctype' because the setlocale() just
* below may destroy it. The next setlocale() further down
* should restore it properly so that the intermediate change
* here is transparent to this function's caller */
const char * const badlocale = savepv(newctype);
setlocale(LC_CTYPE, "C");
/* The '0' below suppresses a bogus gcc compiler warning */
Perl_warner(aTHX_ packWARN(WARN_LOCALE), SvPVX(PL_warn_locale), 0);
setlocale(LC_CTYPE, badlocale);
Safefree(badlocale);
SvREFCNT_dec_NN(PL_warn_locale);
PL_warn_locale = NULL;
}
}
}
#endif /* USE_LOCALE_CTYPE */
PERL_ARGS_ASSERT_NEW_CTYPE;
PERL_UNUSED_ARG(newctype);
PERL_UNUSED_CONTEXT;
}
void
Perl__warn_problematic_locale()
{
#ifdef USE_LOCALE_CTYPE
dTHX;
/* Internal-to-core function that outputs the message in PL_warn_locale,
* and then NULLS it. Should be called only through the macro
* _CHECK_AND_WARN_PROBLEMATIC_LOCALE */
if (PL_warn_locale) {
/*GCC_DIAG_IGNORE(-Wformat-security); Didn't work */
Perl_ck_warner(aTHX_ packWARN(WARN_LOCALE),
SvPVX(PL_warn_locale),
0 /* dummy to avoid compiler warning */ );
/* GCC_DIAG_RESTORE; */
SvREFCNT_dec_NN(PL_warn_locale);
PL_warn_locale = NULL;
}
#endif
}
void
Perl_new_collate(pTHX_ const char *newcoll)
{
#ifdef USE_LOCALE_COLLATE
/* Called after all libc setlocale() calls affecting LC_COLLATE, to tell
* core Perl this and that 'newcoll' is the name of the new locale.
*
* Any code changing the locale (outside this file) should use
* POSIX::setlocale, which calls this function. Therefore this function
* should be called directly only from this file and from
* POSIX::setlocale() */
if (! newcoll) {
if (PL_collation_name) {
++PL_collation_ix;
Safefree(PL_collation_name);
PL_collation_name = NULL;
}
PL_collation_standard = TRUE;
PL_collxfrm_base = 0;
PL_collxfrm_mult = 2;
return;
}
if (! PL_collation_name || strNE(PL_collation_name, newcoll)) {
++PL_collation_ix;
Safefree(PL_collation_name);
PL_collation_name = stdize_locale(savepv(newcoll));
PL_collation_standard = isNAME_C_OR_POSIX(newcoll);
{
/* 2: at most so many chars ('a', 'b'). */
/* 50: surely no system expands a char more. */
#define XFRMBUFSIZE (2 * 50)
char xbuf[XFRMBUFSIZE];
const Size_t fa = strxfrm(xbuf, "a", XFRMBUFSIZE);
const Size_t fb = strxfrm(xbuf, "ab", XFRMBUFSIZE);
const SSize_t mult = fb - fa;
if (mult < 1 && !(fa == 0 && fb == 0))
Perl_croak(aTHX_ "panic: strxfrm() gets absurd - a => %"UVuf", ab => %"UVuf,
(UV) fa, (UV) fb);
PL_collxfrm_base = (fa > (Size_t)mult) ? (fa - mult) : 0;
PL_collxfrm_mult = mult;
}
}
#else
PERL_UNUSED_ARG(newcoll);
#endif /* USE_LOCALE_COLLATE */
}
#ifdef WIN32
char *
Perl_my_setlocale(pTHX_ int category, const char* locale)
{
/* This, for Windows, emulates POSIX setlocale() behavior. There is no
* difference unless the input locale is "", which means on Windows to get
* the machine default, which is set via the computer's "Regional and
* Language Options" (or its current equivalent). In POSIX, it instead
* means to find the locale from the user's environment. This routine
* looks in the environment, and, if anything is found, uses that instead
* of going to the machine default. If there is no environment override,
* the machine default is used, as normal, by calling the real setlocale()
* with "". The POSIX behavior is to use the LC_ALL variable if set;
* otherwise to use the particular category's variable if set; otherwise to
* use the LANG variable. */
bool override_LC_ALL = FALSE;
char * result;
if (locale && strEQ(locale, "")) {
# ifdef LC_ALL
locale = PerlEnv_getenv("LC_ALL");
if (! locale) {
#endif
switch (category) {
# ifdef LC_ALL
case LC_ALL:
override_LC_ALL = TRUE;
break; /* We already know its variable isn't set */
# endif
# ifdef USE_LOCALE_TIME
case LC_TIME:
locale = PerlEnv_getenv("LC_TIME");
break;
# endif
# ifdef USE_LOCALE_CTYPE
case LC_CTYPE:
locale = PerlEnv_getenv("LC_CTYPE");
break;
# endif
# ifdef USE_LOCALE_COLLATE
case LC_COLLATE:
locale = PerlEnv_getenv("LC_COLLATE");
break;
# endif
# ifdef USE_LOCALE_MONETARY
case LC_MONETARY:
locale = PerlEnv_getenv("LC_MONETARY");
break;
# endif
# ifdef USE_LOCALE_NUMERIC
case LC_NUMERIC:
locale = PerlEnv_getenv("LC_NUMERIC");
break;
# endif
# ifdef USE_LOCALE_MESSAGES
case LC_MESSAGES:
locale = PerlEnv_getenv("LC_MESSAGES");
break;
# endif
default:
/* This is a category, like PAPER_SIZE that we don't
* know about; and so can't provide a wrapper. */
break;
}
if (! locale) {
locale = PerlEnv_getenv("LANG");
if (! locale) {
locale = "";
}
}
# ifdef LC_ALL
}
# endif
}
result = setlocale(category, locale);
DEBUG_L(PerlIO_printf(Perl_debug_log, "%s:%d: %s\n", __FILE__, __LINE__,
_setlocale_debug_string(category, locale, result)));
if (! override_LC_ALL) {
return result;
}
/* Here the input category was LC_ALL, and we have set it to what is in the
* LANG variable or the system default if there is no LANG. But these have
* lower priority than the other LC_foo variables, so override it for each
* one that is set. (If they are set to "", it means to use the same thing
* we just set LC_ALL to, so can skip) */
# ifdef USE_LOCALE_TIME
result = PerlEnv_getenv("LC_TIME");
if (result && strNE(result, "")) {
setlocale(LC_TIME, result);
DEBUG_Lv(PerlIO_printf(Perl_debug_log, "%s:%d: %s\n",
__FILE__, __LINE__,
_setlocale_debug_string(LC_TIME, result, "not captured")));
}
# endif
# ifdef USE_LOCALE_CTYPE
result = PerlEnv_getenv("LC_CTYPE");
if (result && strNE(result, "")) {
setlocale(LC_CTYPE, result);
DEBUG_Lv(PerlIO_printf(Perl_debug_log, "%s:%d: %s\n",
__FILE__, __LINE__,
_setlocale_debug_string(LC_CTYPE, result, "not captured")));
}
# endif
# ifdef USE_LOCALE_COLLATE
result = PerlEnv_getenv("LC_COLLATE");
if (result && strNE(result, "")) {
setlocale(LC_COLLATE, result);
DEBUG_Lv(PerlIO_printf(Perl_debug_log, "%s:%d: %s\n",
__FILE__, __LINE__,
_setlocale_debug_string(LC_COLLATE, result, "not captured")));
}
# endif
# ifdef USE_LOCALE_MONETARY
result = PerlEnv_getenv("LC_MONETARY");
if (result && strNE(result, "")) {
setlocale(LC_MONETARY, result);
DEBUG_Lv(PerlIO_printf(Perl_debug_log, "%s:%d: %s\n",
__FILE__, __LINE__,
_setlocale_debug_string(LC_MONETARY, result, "not captured")));
}
# endif
# ifdef USE_LOCALE_NUMERIC
result = PerlEnv_getenv("LC_NUMERIC");
if (result && strNE(result, "")) {
setlocale(LC_NUMERIC, result);
DEBUG_Lv(PerlIO_printf(Perl_debug_log, "%s:%d: %s\n",
__FILE__, __LINE__,
_setlocale_debug_string(LC_NUMERIC, result, "not captured")));
}
# endif
# ifdef USE_LOCALE_MESSAGES
result = PerlEnv_getenv("LC_MESSAGES");
if (result && strNE(result, "")) {
setlocale(LC_MESSAGES, result);
DEBUG_Lv(PerlIO_printf(Perl_debug_log, "%s:%d: %s\n",
__FILE__, __LINE__,
_setlocale_debug_string(LC_MESSAGES, result, "not captured")));
}
# endif
result = setlocale(LC_ALL, NULL);
DEBUG_L(PerlIO_printf(Perl_debug_log, "%s:%d: %s\n",
__FILE__, __LINE__,
_setlocale_debug_string(LC_ALL, NULL, result)));
return result;
}
#endif
/*
* Initialize locale awareness.
*/
int
Perl_init_i18nl10n(pTHX_ int printwarn)
{
/* printwarn is
*
* 0 if not to output warning when setup locale is bad
* 1 if to output warning based on value of PERL_BADLANG
* >1 if to output regardless of PERL_BADLANG
*
* returns
* 1 = set ok or not applicable,
* 0 = fallback to a locale of lower priority
* -1 = fallback to all locales failed, not even to the C locale
*
* Under -DDEBUGGING, if the environment variable PERL_DEBUG_LOCALE_INIT is
* set, debugging information is output.
*
* This looks more complicated than it is, mainly due to the #ifdefs.
*
* We try to set LC_ALL to the value determined by the environment. If
* there is no LC_ALL on this platform, we try the individual categories we
* know about. If this works, we are done.
*
* But if it doesn't work, we have to do something else. We search the
* environment variables ourselves instead of relying on the system to do
* it. We look at, in order, LC_ALL, LANG, a system default locale (if we
* think there is one), and the ultimate fallback "C". This is all done in
* the same loop as above to avoid duplicating code, but it makes things
* more complex. After the original failure, we add the fallback
* possibilities to the list of locales to try, and iterate the loop
* through them all until one succeeds.
*
* On Ultrix, the locale MUST come from the environment, so there is
* preliminary code to set it. I (khw) am not sure that it is necessary,
* and that this couldn't be folded into the loop, but barring any real
* platforms to test on, it's staying as-is
*
* A slight complication is that in embedded Perls, the locale may already
* be set-up, and we don't want to get it from the normal environment
* variables. This is handled by having a special environment variable
* indicate we're in this situation. We simply set setlocale's 2nd
* parameter to be a NULL instead of "". That indicates to setlocale that
* it is not to change anything, but to return the current value,
* effectively initializing perl's db to what the locale already is.
*
* We play the same trick with NULL if a LC_ALL succeeds. We call
* setlocale() on the individual categores with NULL to get their existing
* values for our db, instead of trying to change them.
* */
int ok = 1;
#if defined(USE_LOCALE)
#ifdef USE_LOCALE_CTYPE
char *curctype = NULL;
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
char *curcoll = NULL;
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
char *curnum = NULL;
#endif /* USE_LOCALE_NUMERIC */
#ifdef __GLIBC__
const char * const language = savepv(PerlEnv_getenv("LANGUAGE"));
#endif
/* NULL uses the existing already set up locale */
const char * const setlocale_init = (PerlEnv_getenv("PERL_SKIP_LOCALE_INIT"))
? NULL
: "";
#ifdef DEBUGGING
const bool debug = (PerlEnv_getenv("PERL_DEBUG_LOCALE_INIT"))
? TRUE
: FALSE;
# define DEBUG_LOCALE_INIT(category, locale, result) \
STMT_START { \
if (debug) { \
PerlIO_printf(Perl_debug_log, \
"%s:%d: %s\n", \
__FILE__, __LINE__, \
_setlocale_debug_string(category, \
locale, \
result)); \
} \
} STMT_END
#else
# define DEBUG_LOCALE_INIT(a,b,c)
#endif
const char* trial_locales[5]; /* 5 = 1 each for "", LC_ALL, LANG, "", C */
unsigned int trial_locales_count;
const char * const lc_all = savepv(PerlEnv_getenv("LC_ALL"));
const char * const lang = savepv(PerlEnv_getenv("LANG"));
bool setlocale_failure = FALSE;
unsigned int i;
char *p;
/* A later getenv() could zap this, so only use here */
const char * const bad_lang_use_once = PerlEnv_getenv("PERL_BADLANG");
const bool locwarn = (printwarn > 1
|| (printwarn
&& (! bad_lang_use_once
|| (
/* disallow with "" or "0" */
*bad_lang_use_once
&& strNE("0", bad_lang_use_once)))));
bool done = FALSE;
char * sl_result; /* return from setlocale() */
char * locale_param;
#ifdef WIN32
/* In some systems you can find out the system default locale
* and use that as the fallback locale. */
# define SYSTEM_DEFAULT_LOCALE
#endif
#ifdef SYSTEM_DEFAULT_LOCALE
const char *system_default_locale = NULL;
#endif
#ifndef LOCALE_ENVIRON_REQUIRED
PERL_UNUSED_VAR(done);
PERL_UNUSED_VAR(locale_param);
#else
/*
* Ultrix setlocale(..., "") fails if there are no environment
* variables from which to get a locale name.
*/
# ifdef LC_ALL
if (lang) {
sl_result = my_setlocale(LC_ALL, setlocale_init);
DEBUG_LOCALE_INIT(LC_ALL, setlocale_init, sl_result);
if (sl_result)
done = TRUE;
else
setlocale_failure = TRUE;
}
if (! setlocale_failure) {
# ifdef USE_LOCALE_CTYPE
locale_param = (! done && (lang || PerlEnv_getenv("LC_CTYPE")))
? setlocale_init
: NULL;
curctype = my_setlocale(LC_CTYPE, locale_param);
DEBUG_LOCALE_INIT(LC_CTYPE, locale_param, sl_result);
if (! curctype)
setlocale_failure = TRUE;
else
curctype = savepv(curctype);
# endif /* USE_LOCALE_CTYPE */
# ifdef USE_LOCALE_COLLATE
locale_param = (! done && (lang || PerlEnv_getenv("LC_COLLATE")))
? setlocale_init
: NULL;
curcoll = my_setlocale(LC_COLLATE, locale_param);
DEBUG_LOCALE_INIT(LC_COLLATE, locale_param, sl_result);
if (! curcoll)
setlocale_failure = TRUE;
else
curcoll = savepv(curcoll);
# endif /* USE_LOCALE_COLLATE */
# ifdef USE_LOCALE_NUMERIC
locale_param = (! done && (lang || PerlEnv_getenv("LC_NUMERIC")))
? setlocale_init
: NULL;
curnum = my_setlocale(LC_NUMERIC, locale_param);
DEBUG_LOCALE_INIT(LC_NUMERIC, locale_param, sl_result);
if (! curnum)
setlocale_failure = TRUE;
else
curnum = savepv(curnum);
# endif /* USE_LOCALE_NUMERIC */
# ifdef USE_LOCALE_MESSAGES
locale_param = (! done && (lang || PerlEnv_getenv("LC_MESSAGES")))
? setlocale_init
: NULL;
sl_result = my_setlocale(LC_MESSAGES, locale_param);
DEBUG_LOCALE_INIT(LC_MESSAGES, locale_param, sl_result);
if (! sl_result)
setlocale_failure = TRUE;
}
# endif /* USE_LOCALE_MESSAGES */
# ifdef USE_LOCALE_MONETARY
locale_param = (! done && (lang || PerlEnv_getenv("LC_MONETARY")))
? setlocale_init
: NULL;
sl_result = my_setlocale(LC_MONETARY, locale_param);
DEBUG_LOCALE_INIT(LC_MONETARY, locale_param, sl_result);
if (! sl_result) {
setlocale_failure = TRUE;
}
# endif /* USE_LOCALE_MONETARY */
}
# endif /* LC_ALL */
#endif /* !LOCALE_ENVIRON_REQUIRED */
/* We try each locale in the list until we get one that works, or exhaust
* the list. Normally the loop is executed just once. But if setting the
* locale fails, inside the loop we add fallback trials to the array and so
* will execute the loop multiple times */
trial_locales[0] = setlocale_init;
trial_locales_count = 1;
for (i= 0; i < trial_locales_count; i++) {
const char * trial_locale = trial_locales[i];
if (i > 0) {
/* XXX This is to preserve old behavior for LOCALE_ENVIRON_REQUIRED
* when i==0, but I (khw) don't think that behavior makes much
* sense */
setlocale_failure = FALSE;
#ifdef SYSTEM_DEFAULT_LOCALE
# ifdef WIN32
/* On Windows machines, an entry of "" after the 0th means to use
* the system default locale, which we now proceed to get. */
if (strEQ(trial_locale, "")) {
unsigned int j;
/* Note that this may change the locale, but we are going to do
* that anyway just below */
system_default_locale = setlocale(LC_ALL, "");
DEBUG_LOCALE_INIT(LC_ALL, "", system_default_locale);
/* Skip if invalid or it's already on the list of locales to
* try */
if (! system_default_locale) {
goto next_iteration;
}
for (j = 0; j < trial_locales_count; j++) {
if (strEQ(system_default_locale, trial_locales[j])) {
goto next_iteration;
}
}
trial_locale = system_default_locale;
}
# endif /* WIN32 */
#endif /* SYSTEM_DEFAULT_LOCALE */
}
#ifdef LC_ALL
sl_result = my_setlocale(LC_ALL, trial_locale);
DEBUG_LOCALE_INIT(LC_ALL, trial_locale, sl_result);
if (! sl_result) {
setlocale_failure = TRUE;
}
else {
/* Since LC_ALL succeeded, it should have changed all the other
* categories it can to its value; so we massage things so that the
* setlocales below just return their category's current values.
* This adequately handles the case in NetBSD where LC_COLLATE may
* not be defined for a locale, and setting it individually will
* fail, whereas setting LC_ALL suceeds, leaving LC_COLLATE set to
* the POSIX locale. */
trial_locale = NULL;
}
#endif /* LC_ALL */
if (!setlocale_failure) {
#ifdef USE_LOCALE_CTYPE
Safefree(curctype);
curctype = my_setlocale(LC_CTYPE, trial_locale);
DEBUG_LOCALE_INIT(LC_CTYPE, trial_locale, curctype);
if (! curctype)
setlocale_failure = TRUE;
else
curctype = savepv(curctype);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
Safefree(curcoll);
curcoll = my_setlocale(LC_COLLATE, trial_locale);
DEBUG_LOCALE_INIT(LC_COLLATE, trial_locale, curcoll);
if (! curcoll)
setlocale_failure = TRUE;
else
curcoll = savepv(curcoll);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
Safefree(curnum);
curnum = my_setlocale(LC_NUMERIC, trial_locale);
DEBUG_LOCALE_INIT(LC_NUMERIC, trial_locale, curnum);
if (! curnum)
setlocale_failure = TRUE;
else
curnum = savepv(curnum);
#endif /* USE_LOCALE_NUMERIC */
#ifdef USE_LOCALE_MESSAGES
sl_result = my_setlocale(LC_MESSAGES, trial_locale);
DEBUG_LOCALE_INIT(LC_MESSAGES, trial_locale, sl_result);
if (! (sl_result))
setlocale_failure = TRUE;
#endif /* USE_LOCALE_MESSAGES */
#ifdef USE_LOCALE_MONETARY
sl_result = my_setlocale(LC_MONETARY, trial_locale);
DEBUG_LOCALE_INIT(LC_MONETARY, trial_locale, sl_result);
if (! (sl_result))
setlocale_failure = TRUE;
#endif /* USE_LOCALE_MONETARY */
if (! setlocale_failure) { /* Success */
break;
}
}
/* Here, something failed; will need to try a fallback. */
ok = 0;
if (i == 0) {
unsigned int j;
if (locwarn) { /* Output failure info only on the first one */
#ifdef LC_ALL
PerlIO_printf(Perl_error_log,
"perl: warning: Setting locale failed.\n");
#else /* !LC_ALL */
PerlIO_printf(Perl_error_log,
"perl: warning: Setting locale failed for the categories:\n\t");
# ifdef USE_LOCALE_CTYPE
if (! curctype)
PerlIO_printf(Perl_error_log, "LC_CTYPE ");
# endif /* USE_LOCALE_CTYPE */
# ifdef USE_LOCALE_COLLATE
if (! curcoll)
PerlIO_printf(Perl_error_log, "LC_COLLATE ");
# endif /* USE_LOCALE_COLLATE */
# ifdef USE_LOCALE_NUMERIC
if (! curnum)
PerlIO_printf(Perl_error_log, "LC_NUMERIC ");
# endif /* USE_LOCALE_NUMERIC */
PerlIO_printf(Perl_error_log, "and possibly others\n");
#endif /* LC_ALL */
PerlIO_printf(Perl_error_log,
"perl: warning: Please check that your locale settings:\n");
#ifdef __GLIBC__
PerlIO_printf(Perl_error_log,
"\tLANGUAGE = %c%s%c,\n",
language ? '"' : '(',
language ? language : "unset",
language ? '"' : ')');
#endif
PerlIO_printf(Perl_error_log,
"\tLC_ALL = %c%s%c,\n",
lc_all ? '"' : '(',
lc_all ? lc_all : "unset",
lc_all ? '"' : ')');
#if defined(USE_ENVIRON_ARRAY)
{
char **e;
for (e = environ; *e; e++) {
if (strnEQ(*e, "LC_", 3)
&& strnNE(*e, "LC_ALL=", 7)
&& (p = strchr(*e, '=')))
PerlIO_printf(Perl_error_log, "\t%.*s = \"%s\",\n",
(int)(p - *e), *e, p + 1);
}
}
#else
PerlIO_printf(Perl_error_log,
"\t(possibly more locale environment variables)\n");
#endif
PerlIO_printf(Perl_error_log,
"\tLANG = %c%s%c\n",
lang ? '"' : '(',
lang ? lang : "unset",
lang ? '"' : ')');
PerlIO_printf(Perl_error_log,
" are supported and installed on your system.\n");
}
/* Calculate what fallback locales to try. We have avoided this
* until we have to, because failure is quite unlikely. This will
* usually change the upper bound of the loop we are in.
*
* Since the system's default way of setting the locale has not
* found one that works, We use Perl's defined ordering: LC_ALL,
* LANG, and the C locale. We don't try the same locale twice, so
* don't add to the list if already there. (On POSIX systems, the
* LC_ALL element will likely be a repeat of the 0th element "",
* but there's no harm done by doing it explicitly.
*
* Note that this tries the LC_ALL environment variable even on
* systems which have no LC_ALL locale setting. This may or may
* not have been originally intentional, but there's no real need
* to change the behavior. */
if (lc_all) {
for (j = 0; j < trial_locales_count; j++) {
if (strEQ(lc_all, trial_locales[j])) {
goto done_lc_all;
}
}
trial_locales[trial_locales_count++] = lc_all;
}
done_lc_all:
if (lang) {
for (j = 0; j < trial_locales_count; j++) {
if (strEQ(lang, trial_locales[j])) {
goto done_lang;
}
}
trial_locales[trial_locales_count++] = lang;
}
done_lang:
#if defined(WIN32) && defined(LC_ALL)
/* For Windows, we also try the system default locale before "C".
* (If there exists a Windows without LC_ALL we skip this because
* it gets too complicated. For those, the "C" is the next
* fallback possibility). The "" is the same as the 0th element of
* the array, but the code at the loop above knows to treat it
* differently when not the 0th */
trial_locales[trial_locales_count++] = "";
#endif
for (j = 0; j < trial_locales_count; j++) {
if (strEQ("C", trial_locales[j])) {
goto done_C;
}
}
trial_locales[trial_locales_count++] = "C";
done_C: ;
} /* end of first time through the loop */
#ifdef WIN32
next_iteration: ;
#endif
} /* end of looping through the trial locales */
if (ok < 1) { /* If we tried to fallback */
const char* msg;
if (! setlocale_failure) { /* fallback succeeded */
msg = "Falling back to";
}
else { /* fallback failed */
/* We dropped off the end of the loop, so have to decrement i to
* get back to the value the last time through */
i--;
ok = -1;
msg = "Failed to fall back to";
/* To continue, we should use whatever values we've got */
#ifdef USE_LOCALE_CTYPE
Safefree(curctype);
curctype = savepv(setlocale(LC_CTYPE, NULL));
DEBUG_LOCALE_INIT(LC_CTYPE, NULL, curctype);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
Safefree(curcoll);
curcoll = savepv(setlocale(LC_COLLATE, NULL));
DEBUG_LOCALE_INIT(LC_COLLATE, NULL, curcoll);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
Safefree(curnum);
curnum = savepv(setlocale(LC_NUMERIC, NULL));
DEBUG_LOCALE_INIT(LC_NUMERIC, NULL, curnum);
#endif /* USE_LOCALE_NUMERIC */
}
if (locwarn) {
const char * description;
const char * name = "";
if (strEQ(trial_locales[i], "C")) {
description = "the standard locale";
name = "C";
}
#ifdef SYSTEM_DEFAULT_LOCALE
else if (strEQ(trial_locales[i], "")) {
description = "the system default locale";
if (system_default_locale) {
name = system_default_locale;
}
}
#endif /* SYSTEM_DEFAULT_LOCALE */
else {
description = "a fallback locale";
name = trial_locales[i];
}
if (name && strNE(name, "")) {
PerlIO_printf(Perl_error_log,
"perl: warning: %s %s (\"%s\").\n", msg, description, name);
}
else {
PerlIO_printf(Perl_error_log,
"perl: warning: %s %s.\n", msg, description);
}
}
} /* End of tried to fallback */
#ifdef USE_LOCALE_CTYPE
new_ctype(curctype);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
new_collate(curcoll);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
new_numeric(curnum);
#endif /* USE_LOCALE_NUMERIC */
#if defined(USE_PERLIO) && defined(USE_LOCALE_CTYPE)
/* Set PL_utf8locale to TRUE if using PerlIO _and_ the current LC_CTYPE
* locale is UTF-8. If PL_utf8locale and PL_unicode (set by -C or by
* $ENV{PERL_UNICODE}) are true, perl.c:S_parse_body() will turn on the
* PerlIO :utf8 layer on STDIN, STDOUT, STDERR, _and_ the default open
* discipline. */
PL_utf8locale = _is_cur_LC_category_utf8(LC_CTYPE);
/* Set PL_unicode to $ENV{PERL_UNICODE} if using PerlIO.
This is an alternative to using the -C command line switch
(the -C if present will override this). */
{
const char *p = PerlEnv_getenv("PERL_UNICODE");
PL_unicode = p ? parse_unicode_opts(&p) : 0;
if (PL_unicode & PERL_UNICODE_UTF8CACHEASSERT_FLAG)
PL_utf8cache = -1;
}
#endif
#ifdef USE_LOCALE_CTYPE
Safefree(curctype);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
Safefree(curcoll);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
Safefree(curnum);
#endif /* USE_LOCALE_NUMERIC */
#ifdef __GLIBC__
Safefree(language);
#endif
Safefree(lc_all);
Safefree(lang);
#else /* !USE_LOCALE */
PERL_UNUSED_ARG(printwarn);
#endif /* USE_LOCALE */
return ok;
}
#ifdef USE_LOCALE_COLLATE
/*
* mem_collxfrm() is a bit like strxfrm() but with two important
* differences. First, it handles embedded NULs. Second, it allocates
* a bit more memory than needed for the transformed data itself.
* The real transformed data begins at offset sizeof(collationix).
* Please see sv_collxfrm() to see how this is used.
*/
char *
Perl_mem_collxfrm(pTHX_ const char *s, STRLEN len, STRLEN *xlen)
{
char *xbuf;
STRLEN xAlloc, xin, xout; /* xalloc is a reserved word in VC */
PERL_ARGS_ASSERT_MEM_COLLXFRM;
/* the first sizeof(collationix) bytes are used by sv_collxfrm(). */
/* the +1 is for the terminating NUL. */
xAlloc = sizeof(PL_collation_ix) + PL_collxfrm_base + (PL_collxfrm_mult * len) + 1;
Newx(xbuf, xAlloc, char);
if (! xbuf)
goto bad;
*(U32*)xbuf = PL_collation_ix;
xout = sizeof(PL_collation_ix);
for (xin = 0; xin < len; ) {
Size_t xused;
for (;;) {
xused = strxfrm(xbuf + xout, s + xin, xAlloc - xout);
if (xused >= PERL_INT_MAX)
goto bad;
if ((STRLEN)xused < xAlloc - xout)
break;
xAlloc = (2 * xAlloc) + 1;
Renew(xbuf, xAlloc, char);
if (! xbuf)
goto bad;
}
xin += strlen(s + xin) + 1;
xout += xused;
/* Embedded NULs are understood but silently skipped
* because they make no sense in locale collation. */
}
xbuf[xout] = '\0';
*xlen = xout - sizeof(PL_collation_ix);
return xbuf;
bad:
Safefree(xbuf);
*xlen = 0;
return NULL;
}
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE
bool
Perl__is_cur_LC_category_utf8(pTHX_ int category)
{
/* Returns TRUE if the current locale for 'category' is UTF-8; FALSE
* otherwise. 'category' may not be LC_ALL. If the platform doesn't have
* nl_langinfo(), nor MB_CUR_MAX, this employs a heuristic, which hence
* could give the wrong result. The result will very likely be correct for
* languages that have commonly used non-ASCII characters, but for notably
* English, it comes down to if the locale's name ends in something like
* "UTF-8". It errs on the side of not being a UTF-8 locale. */
char *save_input_locale = NULL;
STRLEN final_pos;
#ifdef LC_ALL
assert(category != LC_ALL);
#endif
/* First dispose of the trivial cases */
save_input_locale = setlocale(category, NULL);
if (! save_input_locale) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not find current locale for category %d\n",
category));
return FALSE; /* XXX maybe should croak */
}
save_input_locale = stdize_locale(savepv(save_input_locale));
if (isNAME_C_OR_POSIX(save_input_locale)) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Current locale for category %d is %s\n",
category, save_input_locale));
Safefree(save_input_locale);
return FALSE;
}
#if defined(USE_LOCALE_CTYPE) \
&& (defined(MB_CUR_MAX) || (defined(HAS_NL_LANGINFO) && defined(CODESET)))
{ /* Next try nl_langinfo or MB_CUR_MAX if available */
char *save_ctype_locale = NULL;
bool is_utf8;
if (category != LC_CTYPE) { /* These work only on LC_CTYPE */
/* Get the current LC_CTYPE locale */
save_ctype_locale = setlocale(LC_CTYPE, NULL);
if (! save_ctype_locale) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not find current locale for LC_CTYPE\n"));
goto cant_use_nllanginfo;
}
save_ctype_locale = stdize_locale(savepv(save_ctype_locale));
/* If LC_CTYPE and the desired category use the same locale, this
* means that finding the value for LC_CTYPE is the same as finding
* the value for the desired category. Otherwise, switch LC_CTYPE
* to the desired category's locale */
if (strEQ(save_ctype_locale, save_input_locale)) {
Safefree(save_ctype_locale);
save_ctype_locale = NULL;
}
else if (! setlocale(LC_CTYPE, save_input_locale)) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not change LC_CTYPE locale to %s\n",
save_input_locale));
Safefree(save_ctype_locale);
goto cant_use_nllanginfo;
}
}
DEBUG_L(PerlIO_printf(Perl_debug_log, "Current LC_CTYPE locale=%s\n",
save_input_locale));
/* Here the current LC_CTYPE is set to the locale of the category whose
* information is desired. This means that nl_langinfo() and MB_CUR_MAX
* should give the correct results */
# if defined(HAS_NL_LANGINFO) && defined(CODESET)
{
char *codeset = nl_langinfo(CODESET);
if (codeset && strNE(codeset, "")) {
codeset = savepv(codeset);
/* If we switched LC_CTYPE, switch back */
if (save_ctype_locale) {
setlocale(LC_CTYPE, save_ctype_locale);
Safefree(save_ctype_locale);
}
is_utf8 = foldEQ(codeset, STR_WITH_LEN("UTF-8"))
|| foldEQ(codeset, STR_WITH_LEN("UTF8"));
DEBUG_L(PerlIO_printf(Perl_debug_log,
"\tnllanginfo returned CODESET '%s'; ?UTF8 locale=%d\n",
codeset, is_utf8));
Safefree(codeset);
Safefree(save_input_locale);
return is_utf8;
}
}
# endif
# ifdef MB_CUR_MAX
/* Here, either we don't have nl_langinfo, or it didn't return a
* codeset. Try MB_CUR_MAX */
/* Standard UTF-8 needs at least 4 bytes to represent the maximum
* Unicode code point. Since UTF-8 is the only non-single byte
* encoding we handle, we just say any such encoding is UTF-8, and if
* turns out to be wrong, other things will fail */
is_utf8 = MB_CUR_MAX >= 4;
DEBUG_L(PerlIO_printf(Perl_debug_log,
"\tMB_CUR_MAX=%d; ?UTF8 locale=%d\n",
(int) MB_CUR_MAX, is_utf8));
Safefree(save_input_locale);
# ifdef HAS_MBTOWC
/* ... But, most system that have MB_CUR_MAX will also have mbtowc(),
* since they are both in the C99 standard. We can feed a known byte
* string to the latter function, and check that it gives the expected
* result */
if (is_utf8) {
wchar_t wc;
PERL_UNUSED_RESULT(mbtowc(&wc, NULL, 0));/* Reset any shift state */
errno = 0;
if ((size_t)mbtowc(&wc, HYPHEN_UTF8, strlen(HYPHEN_UTF8))
!= strlen(HYPHEN_UTF8)
|| wc != (wchar_t) 0x2010)
{
is_utf8 = FALSE;
DEBUG_L(PerlIO_printf(Perl_debug_log, "\thyphen=U+%x\n", (unsigned int)wc));
DEBUG_L(PerlIO_printf(Perl_debug_log,
"\treturn from mbtowc=%d; errno=%d; ?UTF8 locale=0\n",
mbtowc(&wc, HYPHEN_UTF8, strlen(HYPHEN_UTF8)), errno));
}
}
# endif
/* If we switched LC_CTYPE, switch back */
if (save_ctype_locale) {
setlocale(LC_CTYPE, save_ctype_locale);
Safefree(save_ctype_locale);
}
return is_utf8;
# endif
}
cant_use_nllanginfo:
#else /* nl_langinfo should work if available, so don't bother compiling this
fallback code. The final fallback of looking at the name is
compiled, and will be executed if nl_langinfo fails */
/* nl_langinfo not available or failed somehow. Next try looking at the
* currency symbol to see if it disambiguates things. Often that will be
* in the native script, and if the symbol isn't in UTF-8, we know that the
* locale isn't. If it is non-ASCII UTF-8, we infer that the locale is
* too, as the odds of a non-UTF8 string being valid UTF-8 are quite small
* */
#ifdef HAS_LOCALECONV
# ifdef USE_LOCALE_MONETARY
{
char *save_monetary_locale = NULL;
bool only_ascii = FALSE;
bool is_utf8 = FALSE;
struct lconv* lc;
/* Like above for LC_CTYPE, we first set LC_MONETARY to the locale of
* the desired category, if it isn't that locale already */
if (category != LC_MONETARY) {
save_monetary_locale = setlocale(LC_MONETARY, NULL);
if (! save_monetary_locale) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not find current locale for LC_MONETARY\n"));
goto cant_use_monetary;
}
save_monetary_locale = stdize_locale(savepv(save_monetary_locale));
if (strEQ(save_monetary_locale, save_input_locale)) {
Safefree(save_monetary_locale);
save_monetary_locale = NULL;
}
else if (! setlocale(LC_MONETARY, save_input_locale)) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not change LC_MONETARY locale to %s\n",
save_input_locale));
Safefree(save_monetary_locale);
goto cant_use_monetary;
}
}
/* Here the current LC_MONETARY is set to the locale of the category
* whose information is desired. */
lc = localeconv();
if (! lc
|| ! lc->currency_symbol
|| is_invariant_string((U8 *) lc->currency_symbol, 0))
{
DEBUG_L(PerlIO_printf(Perl_debug_log, "Couldn't get currency symbol for %s, or contains only ASCII; can't use for determining if UTF-8 locale\n", save_input_locale));
only_ascii = TRUE;
}
else {
is_utf8 = is_utf8_string((U8 *) lc->currency_symbol, 0);
}
/* If we changed it, restore LC_MONETARY to its original locale */
if (save_monetary_locale) {
setlocale(LC_MONETARY, save_monetary_locale);
Safefree(save_monetary_locale);
}
if (! only_ascii) {
/* It isn't a UTF-8 locale if the symbol is not legal UTF-8;
* otherwise assume the locale is UTF-8 if and only if the symbol
* is non-ascii UTF-8. */
DEBUG_L(PerlIO_printf(Perl_debug_log, "\t?Currency symbol for %s is UTF-8=%d\n",
save_input_locale, is_utf8));
Safefree(save_input_locale);
return is_utf8;
}
}
cant_use_monetary:
# endif /* USE_LOCALE_MONETARY */
#endif /* HAS_LOCALECONV */
#if defined(HAS_STRFTIME) && defined(USE_LOCALE_TIME)
/* Still haven't found a non-ASCII string to disambiguate UTF-8 or not. Try
* the names of the months and weekdays, timezone, and am/pm indicator */
{
char *save_time_locale = NULL;
int hour = 10;
bool is_dst = FALSE;
int dom = 1;
int month = 0;
int i;
char * formatted_time;
/* Like above for LC_MONETARY, we set LC_TIME to the locale of the
* desired category, if it isn't that locale already */
if (category != LC_TIME) {
save_time_locale = setlocale(LC_TIME, NULL);
if (! save_time_locale) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not find current locale for LC_TIME\n"));
goto cant_use_time;
}
save_time_locale = stdize_locale(savepv(save_time_locale));
if (strEQ(save_time_locale, save_input_locale)) {
Safefree(save_time_locale);
save_time_locale = NULL;
}
else if (! setlocale(LC_TIME, save_input_locale)) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not change LC_TIME locale to %s\n",
save_input_locale));
Safefree(save_time_locale);
goto cant_use_time;
}
}
/* Here the current LC_TIME is set to the locale of the category
* whose information is desired. Look at all the days of the week and
* month names, and the timezone and am/pm indicator for UTF-8 variant
* characters. The first such a one found will tell us if the locale
* is UTF-8 or not */
for (i = 0; i < 7 + 12; i++) { /* 7 days; 12 months */
formatted_time = my_strftime("%A %B %Z %p",
0, 0, hour, dom, month, 112, 0, 0, is_dst);
if (! formatted_time || is_invariant_string((U8 *) formatted_time, 0)) {
/* Here, we didn't find a non-ASCII. Try the next time through
* with the complemented dst and am/pm, and try with the next
* weekday. After we have gotten all weekdays, try the next
* month */
is_dst = ! is_dst;
hour = (hour + 12) % 24;
dom++;
if (i > 6) {
month++;
}
continue;
}
/* Here, we have a non-ASCII. Return TRUE is it is valid UTF8;
* false otherwise. But first, restore LC_TIME to its original
* locale if we changed it */
if (save_time_locale) {
setlocale(LC_TIME, save_time_locale);
Safefree(save_time_locale);
}
DEBUG_L(PerlIO_printf(Perl_debug_log, "\t?time-related strings for %s are UTF-8=%d\n",
save_input_locale,
is_utf8_string((U8 *) formatted_time, 0)));
Safefree(save_input_locale);
return is_utf8_string((U8 *) formatted_time, 0);
}
/* Falling off the end of the loop indicates all the names were just
* ASCII. Go on to the next test. If we changed it, restore LC_TIME
* to its original locale */
if (save_time_locale) {
setlocale(LC_TIME, save_time_locale);
Safefree(save_time_locale);
}
DEBUG_L(PerlIO_printf(Perl_debug_log, "All time-related words for %s contain only ASCII; can't use for determining if UTF-8 locale\n", save_input_locale));
}
cant_use_time:
#endif
#if 0 && defined(USE_LOCALE_MESSAGES) && defined(HAS_SYS_ERRLIST)
/* This code is ifdefd out because it was found to not be necessary in testing
* on our dromedary test machine, which has over 700 locales. There, this
* added no value to looking at the currency symbol and the time strings. I
* left it in so as to avoid rewriting it if real-world experience indicates
* that dromedary is an outlier. Essentially, instead of returning abpve if we
* haven't found illegal utf8, we continue on and examine all the strerror()
* messages on the platform for utf8ness. If all are ASCII, we still don't
* know the answer; but otherwise we have a pretty good indication of the
* utf8ness. The reason this doesn't help much is that the messages may not
* have been translated into the locale. The currency symbol and time strings
* are much more likely to have been translated. */
{
int e;
bool is_utf8 = FALSE;
bool non_ascii = FALSE;
char *save_messages_locale = NULL;
const char * errmsg = NULL;
/* Like above, we set LC_MESSAGES to the locale of the desired
* category, if it isn't that locale already */
if (category != LC_MESSAGES) {
save_messages_locale = setlocale(LC_MESSAGES, NULL);
if (! save_messages_locale) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not find current locale for LC_MESSAGES\n"));
goto cant_use_messages;
}
save_messages_locale = stdize_locale(savepv(save_messages_locale));
if (strEQ(save_messages_locale, save_input_locale)) {
Safefree(save_messages_locale);
save_messages_locale = NULL;
}
else if (! setlocale(LC_MESSAGES, save_input_locale)) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Could not change LC_MESSAGES locale to %s\n",
save_input_locale));
Safefree(save_messages_locale);
goto cant_use_messages;
}
}
/* Here the current LC_MESSAGES is set to the locale of the category
* whose information is desired. Look through all the messages. We
* can't use Strerror() here because it may expand to code that
* segfaults in miniperl */
for (e = 0; e <= sys_nerr; e++) {
errno = 0;
errmsg = sys_errlist[e];
if (errno || !errmsg) {
break;
}
errmsg = savepv(errmsg);
if (! is_invariant_string((U8 *) errmsg, 0)) {
non_ascii = TRUE;
is_utf8 = is_utf8_string((U8 *) errmsg, 0);
break;
}
}
Safefree(errmsg);
/* And, if we changed it, restore LC_MESSAGES to its original locale */
if (save_messages_locale) {
setlocale(LC_MESSAGES, save_messages_locale);
Safefree(save_messages_locale);
}
if (non_ascii) {
/* Any non-UTF-8 message means not a UTF-8 locale; if all are valid,
* any non-ascii means it is one; otherwise we assume it isn't */
DEBUG_L(PerlIO_printf(Perl_debug_log, "\t?error messages for %s are UTF-8=%d\n",
save_input_locale,
is_utf8));
Safefree(save_input_locale);
return is_utf8;
}
DEBUG_L(PerlIO_printf(Perl_debug_log, "All error messages for %s contain only ASCII; can't use for determining if UTF-8 locale\n", save_input_locale));
}
cant_use_messages:
#endif
#endif /* the code that is compiled when no nl_langinfo */
#ifndef EBCDIC /* On os390, even if the name ends with "UTF-8', it isn't a
UTF-8 locale */
/* As a last resort, look at the locale name to see if it matches
* qr/UTF -? * 8 /ix, or some other common locale names. This "name", the
* return of setlocale(), is actually defined to be opaque, so we can't
* really rely on the absence of various substrings in the name to indicate
* its UTF-8ness, but if it has UTF8 in the name, it is extremely likely to
* be a UTF-8 locale. Similarly for the other common names */
final_pos = strlen(save_input_locale) - 1;
if (final_pos >= 3) {
char *name = save_input_locale;
/* Find next 'U' or 'u' and look from there */
while ((name += strcspn(name, "Uu") + 1)
<= save_input_locale + final_pos - 2)
{
if (!isALPHA_FOLD_NE(*name, 't')
|| isALPHA_FOLD_NE(*(name + 1), 'f'))
{
continue;
}
name += 2;
if (*(name) == '-') {
if ((name > save_input_locale + final_pos - 1)) {
break;
}
name++;
}
if (*(name) == '8') {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Locale %s ends with UTF-8 in name\n",
save_input_locale));
Safefree(save_input_locale);
return TRUE;
}
}
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Locale %s doesn't end with UTF-8 in name\n",
save_input_locale));
}
#endif
#ifdef WIN32
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd317756.aspx */
if (final_pos >= 4
&& *(save_input_locale + final_pos - 0) == '1'
&& *(save_input_locale + final_pos - 1) == '0'
&& *(save_input_locale + final_pos - 2) == '0'
&& *(save_input_locale + final_pos - 3) == '5'
&& *(save_input_locale + final_pos - 4) == '6')
{
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Locale %s ends with 10056 in name, is UTF-8 locale\n",
save_input_locale));
Safefree(save_input_locale);
return TRUE;
}
#endif
/* Other common encodings are the ISO 8859 series, which aren't UTF-8. But
* since we are about to return FALSE anyway, there is no point in doing
* this extra work */
#if 0
if (instr(save_input_locale, "8859")) {
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Locale %s has 8859 in name, not UTF-8 locale\n",
save_input_locale));
Safefree(save_input_locale);
return FALSE;
}
#endif
DEBUG_L(PerlIO_printf(Perl_debug_log,
"Assuming locale %s is not a UTF-8 locale\n",
save_input_locale));
Safefree(save_input_locale);
return FALSE;
}
#endif
bool
Perl__is_in_locale_category(pTHX_ const bool compiling, const int category)
{
dVAR;
/* Internal function which returns if we are in the scope of a pragma that
* enables the locale category 'category'. 'compiling' should indicate if
* this is during the compilation phase (TRUE) or not (FALSE). */
const COP * const cop = (compiling) ? &PL_compiling : PL_curcop;
SV *categories = cop_hints_fetch_pvs(cop, "locale", 0);
if (! categories || categories == &PL_sv_placeholder) {
return FALSE;
}
/* The pseudo-category 'not_characters' is -1, so just add 1 to each to get
* a valid unsigned */
assert(category >= -1);
return cBOOL(SvUV(categories) & (1U << (category + 1)));
}
char *
Perl_my_strerror(pTHX_ const int errnum) {
/* Uses C locale for the error text unless within scope of 'use locale' for
* LC_MESSAGES */
#ifdef USE_LOCALE_MESSAGES
if (! IN_LC(LC_MESSAGES)) {
char * save_locale = setlocale(LC_MESSAGES, NULL);
if (! isNAME_C_OR_POSIX(save_locale)) {
char *errstr;
/* The next setlocale likely will zap this, so create a copy */
save_locale = savepv(save_locale);
setlocale(LC_MESSAGES, "C");
/* This points to the static space in Strerror, with all its
* limitations */
errstr = Strerror(errnum);
setlocale(LC_MESSAGES, save_locale);
Safefree(save_locale);
return errstr;
}
}
#endif
return Strerror(errnum);
}
/*
=head1 Locale-related functions and macros
=for apidoc sync_locale
Changing the program's locale should be avoided by XS code. Nevertheless,
certain non-Perl libraries called from XS, such as C<Gtk> do so. When this
happens, Perl needs to be told that the locale has changed. Use this function
to do so, before returning to Perl.
=cut
*/
void
Perl_sync_locale(pTHX)
{
#ifdef USE_LOCALE_CTYPE
new_ctype(setlocale(LC_CTYPE, NULL));
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
new_collate(setlocale(LC_COLLATE, NULL));
#endif
#ifdef USE_LOCALE_NUMERIC
set_numeric_local(); /* Switch from "C" to underlying LC_NUMERIC */
new_numeric(setlocale(LC_NUMERIC, NULL));
#endif /* USE_LOCALE_NUMERIC */
}
#if defined(DEBUGGING) && defined(USE_LOCALE)
char *
Perl__setlocale_debug_string(const int category, /* category number,
like LC_ALL */
const char* const locale, /* locale name */
/* return value from setlocale() when attempting to
* set 'category' to 'locale' */
const char* const retval)
{
/* Returns a pointer to a NUL-terminated string in static storage with
* added text about the info passed in. This is not thread safe and will
* be overwritten by the next call, so this should be used just to
* formulate a string to immediately print or savepv() on. */
/* initialise to a non-null value to keep it out of BSS and so keep
* -DPERL_GLOBAL_STRUCT_PRIVATE happy */
static char ret[128] = "x";
my_strlcpy(ret, "setlocale(", sizeof(ret));
switch (category) {
default:
my_snprintf(ret, sizeof(ret), "%s? %d", ret, category);
break;
# ifdef LC_ALL
case LC_ALL:
my_strlcat(ret, "LC_ALL", sizeof(ret));
break;
# endif
# ifdef LC_CTYPE
case LC_CTYPE:
my_strlcat(ret, "LC_CTYPE", sizeof(ret));
break;
# endif
# ifdef LC_NUMERIC
case LC_NUMERIC:
my_strlcat(ret, "LC_NUMERIC", sizeof(ret));
break;
# endif
# ifdef LC_COLLATE
case LC_COLLATE:
my_strlcat(ret, "LC_COLLATE", sizeof(ret));
break;
# endif
# ifdef LC_TIME
case LC_TIME:
my_strlcat(ret, "LC_TIME", sizeof(ret));
break;
# endif
# ifdef LC_MONETARY
case LC_MONETARY:
my_strlcat(ret, "LC_MONETARY", sizeof(ret));
break;
# endif
# ifdef LC_MESSAGES
case LC_MESSAGES:
my_strlcat(ret, "LC_MESSAGES", sizeof(ret));
break;
# endif
}
my_strlcat(ret, ", ", sizeof(ret));
if (locale) {
my_strlcat(ret, "\"", sizeof(ret));
my_strlcat(ret, locale, sizeof(ret));
my_strlcat(ret, "\"", sizeof(ret));
}
else {
my_strlcat(ret, "NULL", sizeof(ret));
}
my_strlcat(ret, ") returned ", sizeof(ret));
if (retval) {
my_strlcat(ret, "\"", sizeof(ret));
my_strlcat(ret, retval, sizeof(ret));
my_strlcat(ret, "\"", sizeof(ret));
}
else {
my_strlcat(ret, "NULL", sizeof(ret));
}
assert(strlen(ret) < sizeof(ret));
return ret;
}
#endif
/*
* ex: set ts=8 sts=4 sw=4 et:
*/
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